Improvement in sewing-machines



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Sewing Machine. No. 74,584. v Patented Feb. 18, 1868.

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Sewing Machine. No. 74,584. Patented Feb. 18, 1868.

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Letters Patent No. 74,584, dated February 18, 1868; antedatcd February7, 1868.

SEWING-MACHINES.

, IMPROVEMENT IN TO ALL WHOM IT MAY concnnn;

Be it known that I, T. O..PAGE, of Chicopee, in the county of Hampden,and Commonwealth of Massachusetts, have invented a new and usefulImprovement in Sewing-Machines; and I do hereby declare that thefollowing is a full and exact description thereof,'reference being hadto the-annexed drawings, making a part of this specificatibn, and to theletters of reference marked thereon, whereof, in plate 1,

Figure 1 is a perspective view of a sewing-machine having my improvementapplied thereto, and, in plate 2,

- Figure 1 is an end elevation of the needle-bar of a sewing-machine,with the parts adjacent and pertaining to such bar, and showing asection of the bed of the table, and the position of the loopcr.

Figure 2 is a vertical section through the line A B, fig. 1.

Figure 3 is an end elevation of the needle-bar, showing the verticalslot or groove therein, and a portion of the'spiral slot or groove. I vI Figure 4 is an elevation of the cap of .the needle-bar; and

Figure 5 is a reverse plan of the same. I

My invention consists in constructing a sewing-machinein such a mannerthat a twisted loop-stitch can be formed thereon, instead of an ordinarychain-stitch, by the combined action of a looping-device and aneedlebar, (and needle,) having a reciprocating rotary motion; and alsoso that the same machine can'be readily adjusted to form the latterstitch, if desired.

The axis of rotation of the bar 'is in a line drawn from the point ofthe needle to the middle point of the top. of the needle-bar, and therotation may be made to turn the needle-bar once around, and cause it toperform an entire revolution, or the bar may make a partof a revolution.For the purpose of forming a twisted loop stitch, the turning of theneedle-bar to make about one-third of a revolution is found-to beasufiicient rotation.

My invention, therefore, has reference to the means which I employ toform the stitches as described, and not to the nature or configurationof those stitches. A looper, orsome equivalent device, beneath thebed-plate of the machine, is necessary to enter and hold the loop ofthread brought down by one thrust of the needle, until a second loop isbrought down by a second thrust of the needle. It is evident that theunread from the loop first seized by the looper will be crossed abovethe looper by the turning of the needle-bar and needle, and that thisthread will remain thus crossed until the needle descends again, andinserts a second loop through the first crossed one, and thus securesthetwist or crossing of the thread made inthe first loop. The thread ofthis second loop will, in like manner, be crossed by the turning of therotating needle-bar, and the twist or crossing of the thread in it willbe secured by the insertion of a third loop, and the same process willbe continued so long as the machine remains adjusted for the forming ofa twisted loop-stitch.

The construction of my invention is as follows: A is the bed-plate of anordinary sewing-machine, supporting the customary parts of an operativesingle-thread machine. 0 is the needle-bur, which is fitted to slide,the direction of its length, in a soclret,f, which may be denominatedthe needle-bar holder, which said holder is attached to the machine byscrews turning into the posts 7: k. The straight needle, t, is insertedin a cylin= drical opening, :1, formed concentrically in the lower endof the needle-bar, and is secured in place by a small set-screw, 6. Asit is necessary to impart to the needle-bar bothareciprocating verticalmotion and a rotary motion, I apply the crank-rod d and crank-pini,.notdirect1y to the needle-bar e, but to a head or cap, a, which has acylindrical opening for receiving the upper end of the needle-bar. Aset-screw, 0, passes through the side of a, and enters the groove 8 outupon the'necdle-bar. The reciprocating 'motion'of the head a will,therefore, be imparted to the needle-bar e by-rneans of the set-screw a,while the bar will be left free to rotate and produce the twistedloop-stitch. A spiral slot, 6, shown in figs. 1 and 3, plate 2, by fulland dotted lines, is formed in the needle-bar e, as shown. A straightlongitudinal slot, Z, is also formed in the lower part of theneedle-bar, asshown in figs. '1, 2, and 3, plate To guide the needle-barby means of the spiral slot, and cause its rota tion, or by means of thestraight slot, a thin strip of steel, 9, is fastened by the screw it tothe socket f, and left free to turn around it as a centre. A small stud,n, projects from the inner face of this spring, g, through the openinga, and enters the spiral slot, 6, in the needle-bar e, or the strip 9may be turned, so that the stud 'n will enter the straight slot Ithrough the lower openingaz. The entering end of the stud 12,:and thesurfaces of the slots 6 and Z are smoothly'finished, and adjusted to oneanother, so as to obviate friction, as far'as possible,

when the stud is engaged in either slot. The strip g is made elastic,-so that it can be retracted to release the stud from either opening, 12,and will also hold the stud securely in either slot of the needle-barwhen inserted therein.

If it be desired to produge a twisted loop-stitch, the operator willturn, the strip g, so that the stud n will enter the spiral slot, asshown by the black lines in fig. 2, plate 2; or if a plain stitch bedesired, the strip 9 will be turned so as to occupy the position shownby the red lines in the last-named figure. When adjusted for eitherstyle of stitch, the machine is operated in the usual manner.

I do not limit myself to the method herein describedof imparting areciprocating motion tothe needle-bar by means of the crank-rod and pinand the head a, as various devices for the same purpose are readilyapplied. The essential parts of my invention are'the means by which I amenabled to impart a reciprocating rotary motion. to the needle-bar.

Having described my invention, what I claim as new therein, and desireto secure by Letters Patent, is-

1. A needle-bar and needle, having a reciprocating rotary motion, incombination with a looping-device, working beneath the bed-plate of themachine, substantially as described.

2. The combination of the spiral slot b'and straight slot Z, formed inthe needle-bar e, substantially as set forth.

Witness my hand, this first day of June, A. -D. 1867.

.T. C. PAGE. Witnesses J. P. BUGKLAND, W. H. SPENCER.

